Which of the following pair of gases will have same rate of diffusion under similar conditions?

Options

A. `H_(2)` and `He`
B. `CO_(2)` and `N_(2)O`
C. `CO` and `C_(2)H_(4)`
D. `NO` and `CO`

Explanation

To determine which pair of gases will have the same rate of diffusion under similar conditions, we can use Graham's law of effusion, which states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass. This means that if two gases have the same molar mass, they will diffuse at the same rate.

### Step-by-Step Solution:

1. **Identify the pairs of gases**: The question provides four pairs of gases:
- Pair 1: H2 and He
- Pair 2: CO2 and N2O
- Pair 3: CO and C2H4
...